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M00002067
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ETSI TS 101 346
Digital cellular telecommunications system (Phase 2+) (GSM); General Packet Radio Service (GPRS); Serving GPRS Support Node (SGSN) - Visitors Location Register (VLR); Gs interface layer 3 specification (GSM 09.18 version 6.5.0 Release 1997)standard by European Telecommunications Standards Institute, 11/01/1999
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